package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    // 切入点
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")



    public void autoFillPointCut() {
    }

    // 拦截方法  前置拦截 在通知中进行公共字段的赋值
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        log.info("开始进行公共字段自动填充");

        // 获取当前被拦截的方法上的注解对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();// 获取方法签名对象
        AutoFill autoFill = joinPoint.getTarget().getClass().getAnnotation(AutoFill.class); // 获取类上的注解对象
        OperationType operationType = autoFill.value();// 获取注解对象中的枚举值

        // 获取到当前被拦截的方法的参数 -- 实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0) {
            log.info("当前方法没有参数，不需要自动填充");
            return;
        }
        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime now  = LocalDateTime.now();
        long currentId = BaseContext.getCurrentId();

        // 根据当前不同的操作类型，为对应的属性进行赋值
        switch (operationType) {
            case INSERT:
                // insert
                log.info("公共字段自动填充[insert]");
                try {
                   Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                   Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                   Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                   Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                    //通过反射为对象属性赋值
                    setCreateTime.invoke(entity,now);
                    setCreateUser.invoke(entity,currentId);
                    setUpdateTime.invoke(entity,now);
                    setUpdateUser.invoke(entity,currentId);

                } catch (NoSuchMethodException | SecurityException | InvocationTargetException |
                         IllegalAccessException e) {
                    throw new RuntimeException(e);
                    //log.info(e.getMessage());
                }
                break;
            case UPDATE:
                // update
                log.info("公共字段自动填充[update]");
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
                break;
            default:
                break;
        }

        log.info("公共字段自动填充完成");



    }
}
